The tiredness wasn't bad for me at all until about 2-3 weeks before I was finished with treatment. But the pain medicine makes me hyper most of the time, also I had someone stopping by my house frequently taking care of all the chores around here and my job is a desk job, work at home, and I can work whenever I want. I would work for an hour, watch TV for an hour or two, work for an hour. So I don't think I ever really did anything to wear myself out. The last few weeks of treatment was a different story, lots of naps.
I am not sure if it was the chemo or the rads that made me tired. I am pretty sure it was the rads because chemo never bothered me very long. I would have viscous, intense side effects for a night and that was it. Except the 2nd dose, I was nauseated for a few days.
If you don't have one yet I would think about a water pic, it is wonderful for during and even better for after treatment. There were times I could not use it during treatment but for the most part I used it on low and helped get some moisture to my dry mouth and rinse out any particles that may be there. After treatment it is even better for the same use and it helps me cough and get up some of the thick phlegm that most of us get after treatment. Glad you got a humidifier, I think that is a must also. That and sleeping in my recliner for a few months now.
Keep hanging on, you can do it!